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Heat Flow - Stationary vs Time Dependent study

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Good Evening,

The mph files for both are added below.

My model is shown in attachment (3).

It consists of a copper strip on a piece of GaAs which rests on a heat sink made of copper. A 20 V Voltage terminal will be on the copper strip and the heat flow will be studied through the GaAs and down into the heat sink. The stationary solution is shown in attachment (4), along with the model in attachment (5).

The next step is to look at a time-dependent study, with a 20 V Voltage Pulse, which repeats on a repetition frequency of 10kHz. The variables and parameters are set up, but the solution does not reach a thermal equilibrium in the time specified, and the result is completely wrong (attachment (2)). I am not sure how to rectify this problem, I have tried different ranges of time yet the solution still does not seem to be working.

My time-dependent model is attachment (1).

Thank you for your time.

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